Device for applying brake-band linings



March 4, 1930. M w c 1,749,615

DEVICE FOR APPLYING BRAKE BAND LININGS Filed July 3, 1924 E JIWIIW 22%.; A15 RT hZ CI/ [7 5 5 Mil W Patented Mar. 4, 1930 UNITED STATES PATENT OFFICE ALB Rr WALCH, or MINNEAPOLIS, MINNESOTA DEVICE FOR APPLYING BRAKE-BAN D LIN'INGS Application filed July 3, 1924. Serial N0. 724,159.

. to such a device whichmay be used as anattachment to the type of drilling and countersinking machine at present employed in the art of relining"brake-bands. The particular object of the invention is to provide an improved attachment for a 10 brake-band drilling and countersink-mg machine, which when used in conjunction there- 'with, will accurately locate the drill and will firmly and securely hold the band andlining while being drilled. A further and more specific object of the invention is to provide such a device having a yieldably mounted clamping means for holding the work, which clamping means may be conveniently actuated by means of a foot-pedal;

A further object is to provide a device of the class having a drill-locating pin mounted therein vwhich is normally held in raised inoperative position and is automatically lowered to engage the brake-band when the clamp is lowered onto the band.

Other objects of the invention will more fully appear from the following description andthe accompanying drawings and willbe pointed out in the annexed claims.

In the drawings there has been disclosed a structure designed to carry out the various objects of the invention but it is to be understood that the invention is not confined to the exact features shown as various changes may be made Within the scope of the claims which follow.

In the drawings:

Figure 1 is a-view in side elevation of a machine for drilling brake-band linings showing my invention applied thereto;

Figure 2 is an enlarged detailed View of the upper portion of the machine, partially in section, showinga brake-band and lining positioned therein;

Figure 3 is a front elevation" of Figure 2, partially broken away to show the position of the-locating pin with reference to the I drilling tool of the machine;

Figure 4 is a sectional 44 of Figure 2; and

Figure 5 is a detailed sectional View on the line55 of Figure 2.

In the selected embodiment of the invention here shown there is illustrated a complan on the line 'mon form of machine for drilling brakeband linings comprising a frame 5, having the usual motor 6 mounted at the upper end thereof which is adapted to drive the operating mechanism of the machine by means of abelt-drive 7. The usual drill 8 is shown adjacent the front side of the machine over which the usual supporting arm 9 is arranged upon which the brake-band and lining is placed when it is desired to drill an aperture in the lining. This arm is pivoted to the frame of the machine at 11 and is normally held in raised position by means of a compression spring 12. The means for operating the-drill 8 is of standard well-known construction and is therefore not shown in the drawings.

The feature of this invention resides in the novel means providedfor clamping or holding the brake-band and lining in place upon the supporting arm 9 while drilling the hole in the lining and also in the means provided for raising the locating pin when the machine is inoperative. A clamp 13,

formed of suitable material and preferably forked as shown in Figure 4, is pivotally mounted upon the supporting arm 9 by means of a pin 14. A connecting link 15 is pivotally connected to the clamp 13 and downwardly extends therefrom and has its lower end pivotally connected to a foot-pedal 16 pivotally mounted on the frame 5 as shown in Figure 1. A suitable tension spring 17 has one end secured to the connecting link 15 and its other end connected to the frame as shown in Figures 1 and 2 and this spring functions to normally hold the clamp 13 in raised inoperative position as particularly shown in Figure 1; An adjusting screw 18 is preferably mounted in the clamp 13 adapted to engage the supporting arm 9 thereby to limitthe downward movement of the clamp 13.

Means are also provided for properly lo- 100 the next hole and the same cating the brake-band and lining upon the supporting arm 9 so that the drill 8 will be in axial alinement with the usual apertures provided in the brake-band to receive the rivet for securing the lining thereto. Such means consists in the provision of a locating pin 19 vertically and slidably mounted in an outwardly extending arm 21 provided on the upper portion of the frame 5.

A weighted collar 22 is adj ustably secured-to the upper portion of the locating pin 19 bymeans of a thumb-screw 23. An angled yoke 24 is pivoted to the frame 5 by means of suit able screws or pins 25 and this yoke is provided with a forked end 26 adapted to'straddle the locating pin 19 beneath the collar 22 as particularly shown in Figure 5. Upwardly extending fingers 27 are secured to the forks of the clamp 13 and these fingers are adapted to engage the yoke 24 as shown in Figure 1 thereby to raise the locating. pin 19 when the clamp 13 is raised to its normal po-" sition. When thus positioned, the forked end 26 0f the yoke 24'will engage the lower face of the collar 22 and will thereby raise the pin 19. i

In the operation of this novel device, in

conjunction with a drilling machine such as here shown, the brake-band, after the lining has been positioned therein, will be, placed upon the supporting arm 9. The operator will then downwardly move the clamp 13 by meansof the foot-pedal 16 and against the tension of the spring 17 until the locating pin 19 engages the brake-band. The brakeband and lining will then be slightly moved upon the supporting arm 9 until the pin 19 drops into one of the apertures or rivet holes in the brake-band as shown in Figures 2 and ,3. As soon as the pin 19 drops'into an aperture as above described, the operator will be assured that the drill or tool 8 will be in axial alinement with the aperture in the brakeband, and he will then bear down on the footpedal 16 thereby causing the clamp 13 to downwardly force or press the brake-band and lining against the supporting arm 9, which in turn will be downwardly moved against the compression of the spring 12,

thereby causing the tool 8 to pass throughor form an aperture in the lining, which aperture will be in alignment with the correspond ing aperture in the brake-band. He will then release the pressure on the foot-pedal and the spring 17 will return the clamp to its normal inoperative position as shown in Figure 1 iiiwhich position the locating pin 19 will also be raised out of engagement with the brake-band by means of the fingers 27 engaging the yoke 24 which in turn engages the collar 22 and thereby lifts the pin. He will then move the brake-band and lining to cycle of operation will be performed.

Thus, it will readily be seen that by the position while the lining is being drilled; 1

It will be noted by an inspection of Figure '1 that the locating pin is lowered to operative position on a downward movement of the employment of this novel device, it will be 13, the brake-band and lining will be securely and firmly held in l clamp element 18, and '(note particularly) before the element 13 acts to entrainthe work support to bring the work into engagement with the tool. In other words, by a partial downward movement of the element 13, and before it reaches clamping position the locating pin reaches operative position, this so that the work can be adjusted before it is clamped. Immediately after adjustment and before it can slip, the clamp engages the work to secure it in that particular adjusted or located position, during the drilling operation. 7

Having thus described my invention" what I claim as new and desire to secure by Letters 7 Patent, is r 1. A device of the class described including a vertically arranged drill, a swingable work support yieldably held in raised position above the drill, a work clamp pivoted to said work support to engage work positioned over the drill and upon the support, and amanually operable connection pivoted to said pivoted clamp in such manner that upon moveagainst the work, and continued movement holds the clamp and lowers the work during drilling. I I V p 2. A device of the class described including a vertically arranged drill, a swingable work 7 support yieldably held in raised position above the drill, a work clamp pivoted to said work support t o engage work positioned over the drill and upon the support, and a manually operable connection pivoted to said piva i a ment of the connection in one direction the clamp is first brought to clamping position oted clamp in such manner that upon movement of the connection in one direction the clamp is first brought to clamping position against the work, and continued movement holds the clamp and lowers the work during drilling, a locating pin reciprocable in the machine toward the drill and aliiied therewith, said pin being gravity operable, a pivoted lever engaging a. stop on said pin for raising the same and said work clamping member being engageable with said lever for raising the same when said work clamping member is raised to release thework.

- same direction the arm and work are r to move towards the drill.

3. A device of the-class described comprismg a drill, a plvoted work supportmg arm, a

clamping arm pivoted to the work support- U rection move work support and work toward the drill.

4.- A device of the class described,-comprising a drill, a pivoted work-supporting arm arranged to move the work towards the drill,

' a spring acting to retract the work arm, a

clamping arm pivoted to the work supporting arm and arranged to engage work supported by the arm by a movement towards the drill, means connected to the clamp for advancing itto work-clamping position, including a r traction spring, the arrangement being such that the clamp is first caused to engage the work and then by a farther movement in the caused 5. A device of the class described, comprising a drill, apivoted work-supporting arm arranged to move downwardly toward the drill, a clamping arm pivoted to the work-supporting arm and arranged to engage work sup ported bythe arm by a movement towards the drill, means connected to the clamp for advancing it to work-clamping position, the arrangement being such that the clamp is first caused to engage the work and then by a farther movement in the same direction the arm and work are caused to move towards the drill.

6. A device of the class described comprising a drill, a pivoted work-supporting arm,

a'clamping arm pivoted to the work-supporting arm and arranged to engage work supported by the arm, means connected to said clamp for advancing it to work-clamping position, the arrangement being such that the clamp is first caused to engage the work and then by a fart-her move-mentin the same direction the Work is caused to move towards the drill, a gravity-operable locating pin, and means for raising the pin from and for releasing it for gravity advance to operative position, such means being controlled by the clamp so that the pin is caused to advance as the clamp moves toward clamping position.

7. A device of theclass described comprising a drill, a pivoted work-supporting arm,

" a clamping arm pivoted to the work-support ing arm and arranged to engage work supported by the arm, means connected to said clamp for advancing it to work-clamping position, the arrangement being such that the clamp is first caused to engage the work and then by a farthermovement in the same direction the work is caused to move towards the drill, a locating pin, and means for controllingthe movement oftihe pin respectively toward and away from operative position, said means being controlled by said clamp so that the pin is caused to advance as the clamp moves toward clamping position, the clamp is retracted, the arrangement being such that the pin reaches locating position upon the work oefore the clamp engages the work.

8. A device of the class described, comprising a drill, a pivoted work-supporting arm arranged to move the work toward the drill, a clamping arm pivoted to the work supporting arm and arranged to engage work supported by the arm by a movement toward the drill, means connected to the clamp for advancing it to work-clamping position, the arrangement being such that the clamp is first caused to engage the work and then by a farther movement in the same direction the arm is caused to move toward the drill, a locating pin automatically movable to operative position, and having a stop, a pivoted elementengageable with the stop, and arranged to be engaged by the clamping arm and retracted as said arm moves away from the work, the arrangement being such that the pin is released as the clamping arm advances to clamping position, and reaches operative position before the clamping arm engages the work. i

9. A device of the class described comprising a drill, a pivoted work-supporting arm arranged to move the work toward the drill, a clamping arm pivoted to the work-supporting arm and arranged to engage work supported by the arm, by a movement toward the drill, means connected to said clamp for advancing it to work-clamping position, the arrangement being such that the clamp is first caused to engage the work and then by a farther movement in the same direction the work is caused to move towards the drill, a locating pin, automatically movable to operative position, and means for controlling the movement of the pin respectively toward and away from operative position, such that the pin is caused to advance as the clamp moves toward clamping position, and such that as the clamp is retracted to release the work, the pin is moved to inoperative position.

10. A device of the class described comprising a drill, a pivoted work-support arm arranged to lower the work toward the drill, a clamping arm pivoted to the work-support arm, and arranged to engage work supported by the arm by a movement towards the drill, means connected to said clamp for positively advancing it to work-clamping position, the arrangement being such that the clamp after engagement withthe work, forces the arm towards the drill, a locating pin and means for controlling the movement of the pin respectively toward and away from operative position, such that the pin is caused to autor is moved to inoperative position, the arrange= ment further being such that the pin reaches matically advance as the clamp rnoves toward clamping p0sition,and such that as the clamp is retracted to release the work the pin locating position upon the work before the clamp engages the work. I

11. A device of the class described comprising a drill a pivoted work-supporting arm arranged above the drill, yieldable means normally holding the arm in raised position a clamping arm pivoted to the worksupporting arm and arranged to clamp the work against said supporting arm means pivoted to said clamp arm for lowering the clamp and Work support by means of said clamping arm, the arrangement being such that the clamp first engages the work and further movement in the same d1rect1on causlng'the Work arm to move for the dr1lling operation, a locating pin, movable by V gravity to operative position, gravity releasable connections between the work clamp and locating pin arranged to release the pin for gravity advance as the clamp moves to clamping position, and further arranged so that as the clamp is raised to release the work the pin is raised to inoperative position.

In witness whereof, I have hereunto set my hand this 28th day of June, 1924-.

' ALBERT M. VVALOH. 

